Guard for motor driven fans



Awnll 7, WW I c. E HOFF ET AL fi fl GUARD FOR MOTOR DRIVEN FANS Filed Sept. 8, 1933.

fiw. 12 M INVENTOR$ MA WLES .51 HOW! BY P Patented Apr. 7, 1936 UNITED sures EPA NT QFFICE 1 Claim.

Our invention relates to a guard for motor driven fans.

The object of our invention is to provide a guard that will protect the front, rear, and sides of the fan element.

A further object of our invention is to provide an auxiliary guard snugly engaging and carried by the principal guard that is secured to the fan motor housing and convenient means to disassemble the auxiliary guard for placing and removing.

A still further object of our invention is to provide a guard that the rear portion thereof will conform to a forward slant of the original guard arms.

A still further object of our invention is to provide an auxiliary guard preferably made of woven wire comprising a front, rear, and annular Wall secured together, and rear wall removable from the annular wall to engage about the fan motor housing.

These and other objects will hereinafter be more fully explained, reference being had to the accompanying drawing forming a part of this specification, and in which like characters will apply to like parts in the diiferent views.

Referring to the drawing:

Fig. 1 is a front View of the guard and fan.

Fig. 2 is. a view of the rear head showing the opening to receive the motor housing and the lap of the ends for conical form.

Fig. 3 is a side View of the fan and guard parts removed for convenience of illustration.

Fig. 4 is a top view of a fragmentary portion of the annular Wall showing the hook pivoting means.

Fig. 5 is a plan View of the clip.

Fig. 6 is a side View of Fig. 5.

Fig. '7 is a side view of a modified form of clip for securing the lapped portions of the rear head together.

Our invention herein disclosed consists of a guard preferably made of woven wire fabric, the mesh ranging from one eighth to one half inch, but we do not wish to be confined to such size alone, and adapted to engage on and carried by the original guard that is secured to the fan motor housing.

As disclosed in Figs. 1 and 3, we have shown a fan comprising a base I, a motor housing 2, and fan blades 3 shown by dotted lines.

The guard consists of a front head 4 disc like in form, and an annular wall 5 joined to the said head by the fold of the woven wire about an annular wire 6. Carried on the rear of the guard is a disc like head 1 having an opening 8 concentric to receive the motor housing 2 snugly fitting therein. The marginal edge around the opening is supported by a wire 9 secured thereto by turning the wire fabric therearound. A similar wire I is secured to the outside peripheral edge of the head in a like manner.

Being thus formed we have radially cut the head I from the outside to the center severing the same, by which means the end portion adjacent the cut may be lapped as shown at A to conically form the head conforming to the forward slope of arms II supporting the original guard consisting of an annular ring l2 to the rear of the blades and to which the said arms are attached at the outer end, the inner ends secured to the motor housing, and a plurality of spokes l3 crossing in front of the said fan blades, the outer ends of which return at right angles to the said ring i2 as supporting means for our woven wire guard substantially as shown.

The rear head of the guard is secured to the annular wall thereof thru the medium of a pair of clips I l diametrically and horizontally positioned, there being a wing portion B secured to the annular wall, and another wing portion 0 secured to the head. The outer ends of the said portions have an eye D on each to engage in registry and secured by a cotter pin l engaging in the eyes.

We have also arranged a similar clip M on the vertical lap of the rear disc 1 and having the wing element on the head U-shaped to fold on each side of the lap of the woven wire and secured together by a tongue l6 punched from one wing and adapted to pass thru the mesh of the wire and thru an aperture in the other wing member and clinched as shown in Fig. 2.

Diametrically opposite to the last said clip on the rear head of the fan guard is a hook il integral with wire 10 and adapted to engage in an apertured plate It secured to the annular wall, by which means the said annular wall and its front head may rock outward as shown by dotted line E when the clips are released by removing the respective pins I5, at which time the said hook may be detached.

Such modifications may be employed as lie within the scope of the appended claim, and having fully described our invention what we claim as new and desire to secure by Letters Patent is In a woven wire guard for motor driven fans, the guard comprising an annular wall and a front head rigidly joined and a conical woven member for the rear head, the latter having a circular opening and severed from the opening outward radially, the ends formed by the sever being lapped to conically form the rear head, a wing member secured to the rear head, the wing having an eye on the outer end thereof, a U- shaped member the legs of which are spaced apart to receive the lapped ends of the head therebetween, one leg of the U-shaped member having an eye on the outer end and a tongue medially positioned on the leg with respect to the same longitudinally, the other leg having an aperture through which the tongue is inserted and clinched by bending the tongue at right angles, the eyes of each said members being secured together by a cotter pin as attaching means for the conical head to the wall at one point, a circular wire having a hook formed by bending the wire, the hook radially extending outward, the said wire being secured to the peripheral edge of the conical head, apertured means secured to the annular wall to engage the hook as securing means for the conical head to the wall at another point. 10

CHARLES E. HOFF. ADA HOFF. 

